linux-kernel - Re: [PATCH] MM: Support more pagesizes for MAP_HUGETLB/SHM

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Message-ID: <79194.1351033000@turing-police.cc.vt.edu>
Date:	Tue, 23 Oct 2012 18:56:40 -0400
From:	Valdis.Kletnieks@...edu
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Andi Kleen <andi@...stfloor.org>, akpm@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Hillf Danton <dhillf@...il.com>
Subject: Re: [PATCH] MM: Support more pagesizes for MAP_HUGETLB/SHM_HUGETLB v6

On Mon, 22 Oct 2012 08:36:33 -0700, Andi Kleen said:

> Thinking about it more PowerPC has a 16GB page, so we probably
> need to move this to prot.

Gaak - is that a typo?  If not, what is the use case - allowing a small number of
pages to cover all memory, with big wins on TLB hit ratios?  I certainly can't see
it as a sane primitive for a virtual memory design that does paging/swapping?

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